Hydraulic nozzle



Se t. 1927.

p F. SCHMIDT HYDRAULIC NOZZLE Filed July 12, 1925 Patented Sept. 6, 1927.

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MANUFACTURING COIVIPANY, OF MIL'WAUKEE, WISCONSIN, A CORPORATION OF DELAWARE.

HYDRAULIC NOZZLE.

Application filed July 12, 1926. Serial No. 122,025.

This invention relates in general to improvements 1n the art of hydraulics, and relates more specifically to improvements in the construction and operation of nozzles for producing controllable jets of water having high velocity.

An object of the invention is to provide an improved nozzle structure which is sim ple in construction and efiicient in operation. Another object ofthe' invention is to provide improved means for supporting the adjustable needles of nozzles, with minimum obstruction to the flow of fluid through the nozzle supply conduit. A further object of the inventionis to provide an improved control needle structure for hydraulic'nozzles or the like, wherein undesirable chattering or vibration of the-needle is positively avoided. Theseand other objects and advantages will appear from the following description.

A. clear conception of an embodiment of the invention and of the mode of constructmg and of manipulating devices built in accordance therewith, may be had by referring to the drawing accompanying and forming a part of this specification in which like reference characters designate the same or similar parts in the various views. I

Fig. 1 is a central vertical section through a hydraulic turbine installation of the impulse type, having the improved nozzle applied therein.

Fig.2 is an enlarged central vertical section through one of the improved hydraulic nozzles.

45.:nular series of buckets 3 secured to the aperiphery thereof. The rotor 2 is direct connected to the energy absorber 15 by means ofthe horizontal .nain shaft, and a nozzleis disposed to direct a jet of water traveling athigh velocity, against the successive buckets 3 of the rotor 2. The nozzle and rotor are supported'upon a foundation 12 which also provides a support for the rotor castainer ring 25 and stud bolts 27.

ing 14: and for an energy absorbing jet deflector 13.

The improved hydraulic nozzle diagrammatically illustrated in Fig. 1, is shown more in detail in Figs. 2 and 3. This nozzle comprises a main casing and a cap 4t cooperating to form a fluid conducting conduit which communicates with the supply pipe 28 at one end and which has a discharge orifice at the opposite end thereof. The nozzle cap 4 is detachably secured to the main casing 5 by means of a clamping ring 23 and clamping bolts 26. v A. nozzle orifice ring 24. is detachably secured to the forward end of the cap 4 by means of a re- Secured centrally within the casing 5 and closely adjacent to the nozzle orifice, is a hub 16 which is supported from an annular bearing ring 17 by means of relatively thin but wide radial supporting ribs 7. The hub supporting ring 17 is fitted within a bore in the casing ,5 and is clamped in position by means of the cap 4, the ring 23, and the bolts 26. The

casing ,5 is provided with a rearwardly extending tubular projection formed concentr1c with the hub '16 and with the nozzle orifice, and a bearing is disposed within this casing projection. The needle stem 6 is slidably supported in the hub 16 and in the bearing 10, and extends rearwardly from the orifice through the wall of the casing 5. A stuffing box 11 prevents leak age of water from. within the casing 5 past the bearing 10,'and a servo-motor9 is associated with the stem 6 rearwardly of the stuffing box 11 at the outside of the nozzle casing 5. A sectional needle 8 is secured to the forward end ofthe stem 6, this needle comprising a point section. 18, a tubular end section 20, and an intermediate section 19. The portions or sections 18, '19, of the needle are detachably connected to the end of the stem 6. The point section 18 cooperates directly with the nozz'le orifice tocontrol the flow theret-hrough, and the tubular section 20 extends rearwardly over and'embraces the forward portion of the hub '16.

The hub 16 may 'be provided'with a lubricant chamber 21 to which lubricant'maybe conducted through a pipe 22and an opening in one of theradial'ribs 7.

During normal operation of the nozz'le, the

needle 8 and the stem 6 may be adjusted within the hub 16 and the bearing 10 to any desired position, by means of the servo-motor 9. \Vhen the needle is in its extreme forward position, the point section 18 thereof engages the orifice ring 24- and entirely shuts off the flow. hen the needle 8 is retracted to its extreme position away from the orifice, the maximum jet is obtained. The jet issuing from the nozzle strikes the buckets 3 of the rotor 2 and produces rotation of the rotors oi the turbine and of the energy absorbing devices. The jet after leaving the buckets 3 impinges against the deflector 13 from whence the water is conducted to a tail-race in the usual manner.

By'providing the hub 16 within the casing 5 closely adjacent to the needle 8 and to the nozzle orifice, maximum support for the needle is obtained with minimum obstruction to the flow of water through the nozzl I P The radlal ribs provide rigid supports for the hub 16 and the bearmg afforded by this hub may be conveniently lubricated through the pipe 22. The tubular section 20 of the needle besides providing additional support therefor, also provides a smooth fluid conducting conduit for the water approaching the orifice and maintains a symmetrical an nular section of the conduit for all positions of adjustment of the needle 8. The bearing 10 provides additional support for the needle stem 6, and due to the fact that the stem 6 is effectively supported by the hub '16 and the bearing 10, it may be formed of minimum diameter thereby offering lleastobstruction to the flow of fluid through the casing 5. The needle 8' as well as the nozzle casings may be readily dismantled and as sembledrand the stuffing box 11 effectively prevents leakage of fluid from within the casing 5 past the bearing 10.

It should be understood that it is not desired to limit the invention to the exact details of construction and ope-ration herein shown and described, for various modifications within the scope of the claims may occur to persons skilled in the art.

It is claimed and desired to secure by Letters Patent:

1. In combination, means forming a fluid conducting conduit having a discharge orifice communicating therewith, a hub secured within said conduit closely adjacent to said orifice, a stem adjustable along said hub, saidstem extending away from said orifice and penetrating said conduit forming means, and a needle associated with said stem and cooperable with said orifice to control the flow of fluid therethrough, said needle having a portion extending away from said orifice and directly slidably engaging said hub.

V 2. In combination, a casing forming a fluid conducting conduit having a discharge orifice communicating therewith, a hub secured centrally within said conduit closely adjacent to said orifice, a stem slidable along and supported within said hub, said stem extending away from said orifice and penetrating said casing, and a needle secured to an end of said stem and cooperating with said orifice to control the flow of fluid therethrough, said needle having a portion surrounding and movable along said hub.

3. In combination, acasing forming a fluid conducting conduit having a discharge orifice at an end thereof, a hub disposed centrally within said conduit closely adjacent to said orifice, a plurality of ribs secured to said casing and to said hub and spanning said conduit, a stem slidably supported by said hub, said stem extending away from said orifice and penetrating said casing, means associated with said stem outside of said casing for moving said stem, and a needle associated with said stem and cooperable with said orifice to control the flow of fluid therethrough, said needle having a portion extending away from said orifice and embracing said hub.

4. In combination, a casing forming a fluid conducting conduit having a discharge orifice at an end thereof, a hub secured centrally within said conduit closely adjacent to said orifice, radial ribs for'supporting said hub from said casing,- said ribs spanning said conduit, a stem slidably supported within said hub, and a needle secured to the end of said stem and cooperable'with said orifice to control the flow of fluid therethrough, said needle having a portion embracing said hub.

5. In combination, a casing forminga fluid conducting conduit having an end discharge orifice, a hub secured centrally within said conduit closely adjacent to said orifice, a bearing secured to said casing con' centric with and remote from said hub, a stem slidably supported by said hub and said bearing, and a needle associated with said stem and cooperable with said orifice to control the flow of fluid therethrough, said. needle having a. portion extending away from said orifice and embracing said hub.

, 6. In combination, a casing forming a fluid conducting conduit having an enddischarge orifice, a hub secured centrally within said conduitclosely adjacent to said orifice, a bearing secured to said casing concentric with and remote from said hub, a stem slidably supported by said hub and said bearing, and a needle associated with said stem and cooperable with said orifice to control the flow of fluid therethrough, said needle having aportion embracing the end of said hubremote from said bearing.

- 7. In combination, a casing forming a fluid conductlng conduit having an end discharge orifice, a stem movable within said casing in alinement with said orifice, a needle secured to an end of said stem and cooperable with said orifice to control the flow of fluid therethrough, said needle comprising a point section and a tubular bearing section detachably associated with said point section, and means slidably engaging the interior of said tubular bearing section.

8 In combination, a casing forming a fluid conducting conduit having an end discharge orifice, a hub secured centrally with-- in said conduit, a stem slidably supported within said hub in alinement with said orifice, and a needle secured to an end of said stem and cooperable with said orifice to control the flow of fluid therethrough, said needle comprising a point section movable Within said orifice and a tubular section detachably associated with said point section and embracing an end of said hub.

9. In combination, means forming a fluid conducting conduit having a vdischarge orifice, a hub supported within said conduit closely adjacent to said orifice, a stem having a portion slidable in said hub and eX- tending rearwardly into said conduit, and a needle carried by said stem and cooperating with said orifice, said needle having a portion of larger diameter than said stem portion slidahly engaging said hub.

In testimony whereof, the signature of the inventor is afiixed hereto.

FRANZ SCHMIDT. 

